CS8900A datasheet(6/128 Pages) CIRRUS

6 / 128 page

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

5.2.1.3 Transfer ............................................................................................................................ 81

5.2.2 Receive Configuration ............................................................................................................... 81

5.2.2.1 Configuring the Physical Interface.................................................................................... 81

5.2.2.2 Choosing which Frame Types to Accept .......................................................................... 81

5.2.2.3 Selecting which Events Cause Interrupts ......................................................................... 82

5.2.2.4 Choosing How to Transfer Frames .................................................................................. 82

5.2.3 Receive Frame Pre-Processing ................................................................................................. 83

5.2.3.1 Destination Address Filtering ........................................................................................... 83

5.2.3.2 Early Interrupt Generation ................................................................................................ 84

5.2.3.3 Acceptance Filtering ......................................................................................................... 84

5.2.3.4 Normal Interrupt Generation............................................................................................. 84

5.2.4 Held vs. DMAed Receive Frames.............................................................................................. 84

5.2.5 Buffering Held Receive Frames ................................................................................................. 84

5.2.6 Transferring Held Receive Frames ............................................................................................ 86

5.2.7 Receive Frame Visibility............................................................................................................. 86

5.2.8 Example of Memory Mode Receive Operation .......................................................................... 86

5.2.9 Receive Frame Byte Counter..................................................................................................... 87

5.3 Receive Frame Address Filtering ........................................................................................................ 87

5.3.0.1 Individual Address Frames............................................................................................... 88

5.3.0.2 Multicast Frames .............................................................................................................. 88

5.3.0.3 Broadcast Frames ............................................................................................................ 88

5.3.1 Configuring the Destination Address Filter ................................................................................ 88

5.3.2 Hash Filter ................................................................................................................................. 89

5.3.2.1 Hash Filter Operation ....................................................................................................... 89

5.3.3 Broadcast Frame Hashing Exception ........................................................................................89

5.4 Receive DMA ...................................................................................................................................... 90

5.4.1 Overview .................................................................................................................................... 90

5.4.2 Configuring the CS8900A for DMA Operation ........................................................................... 90

5.4.3 DMA Receive Buffer Size .......................................................................................................... 90

5.4.4 Receive-DMA-Only Operation ................................................................................................... 91

5.4.5 Committing Buffer Space to a DMAed Frame............................................................................ 92

5.4.6 DMA Buffer Organization ........................................................................................................... 92

5.4.7 RxDMAFrame Bit ....................................................................................................................... 92

5.4.8 Receive DMA Example Without Wrap-Around .......................................................................... 92

5.4.9 Receive DMA Operation for RxDMA-Only Mode ....................................................................... 92

5.5 Auto-Switch DMA ................................................................................................................................ 93

5.5.1 Overview .................................................................................................................................... 93

5.5.2 Configuring the CS8900A for Auto-Switch DMA........................................................................ 94

5.5.3 Auto-Switch DMA Operation ...................................................................................................... 94

5.5.4 DMA Channel Speed vs. Missed Frames .................................................................................. 95

5.5.5 Exit From DMA........................................................................................................................... 95

5.5.6 Auto-Switch DMA Example........................................................................................................ 96

5.6 StreamTransfer ................................................................................................................................... 96

5.6.1 Overview .................................................................................................................................... 96

5.6.2 Configuring the CS8900A for StreamTransfer ........................................................................... 96

5.6.3 StreamTransfer Operation ......................................................................................................... 96

5.6.4 Keeping StreamTransfer Mode Active .......................................................................................96

5.6.5 Example of StreamTransfer ....................................................................................................... 98

5.6.6 Receive DMA Summary............................................................................................................. 98

5.7 Transmit Operation.............................................................................................................................. 99

5.7.1 Overview .................................................................................................................................... 99

5.7.2 Transmit Configuration............................................................................................................... 99

5.7.2.1 Configuring the Physical Interface.................................................................................... 99

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